When she speaks about a particular situation or event, that situation will eventually proceed to reverse itself, through whatever means possible. If she speaks about an attempt to achieve a goal, it will fail in some way. If she speaks about something bad occurring, it will be resolved in some way. Due to this, she tends to not speak too much and always chooses her words carefully. Note that it is the situation or the event she talks about that will be reversed in some manner; it is not that the opposite of what she says must occur.

In Legacy of Lunatic Kingdom, Sagume had thought of a backup plan to move the Lunar Capital to Gensokyo in case Junko's actions eventually forced the Lunarians to leave their temporary refuge in the Dream World. However, when the player shows up to take care of Junko, Sagume realizes her opportunity to help save the Lunar Capital. By talking to the protagonist about their plan to invade Gensokyo, her ability ensures that the plan will not come to fruition. By doing so, Sagume bets on the likelihood that the reason they will not end up relocating to Gensokyo is because the protagonist will in fact save the Lunar Capital. By talking to the player directly, she forced the situation to reverse around them.

Occult Balls

Using her powers, Sagume created a secret occult ball. It had the power to change the world by using people's words, and merely being near it would cause false rumors, such as urban legends, to materialize. Although it was just insurance, the plan was to use it to materialize the Lunar Capital in Gensokyo by spreading rumors about NASA hiding the truth about what they saw on the Moon. This also caused numerous lesser urban legends to materialize, starting the events of Urban Legend in Limbo. It is currently in possession of Marisa Kirisame.[1]

She is a goddess, but she has a part of her that is a Heavenly God (天津神,Amatsukami) represented by the sole wing on her back and a part that is a Earthly God (土着神,Kunitsukami)[2]. Other than being a Lunarian, Sagume can also "tentatively" be classified as a divine spirit, but it is said that her true nature isn't that of a god, an oni, or a departed soul. She is also considered a type of amanojaku.[3]

Her full name is Sagume Kishin (稀神サグメ). Her last name, Kishin (稀神), means "rare god". It differs from kishin (鬼神), which means "oni god" and the Kijin in Seija Kijin (鬼人), which means "oni human" and forms a part of her and Seija's species, amanojaku.[4]

ZUN also relates her with sagi (サギ) which means Heron (鷺,sagi) and can also be read as swindler (詐欺,sagi).[2]

Sagume has short, light grey hair with a braid on the back, red eyes, and a single wing on her back. She wears a purple dress, the bottom of which is cut into an arrow pattern, with a red microphone bowtie, a tan jacket, and brown shoes.

Sagume encounters the protagonists in the already deserted Lunar Capital, after revealing the nature of their visit she proceeds to test their strength to see if they're capable of confronting the person attacking the Moon and, by consequence, stop the invasion to Gensokyo.

Due to Eirin being a sage of the Moon before fleeing to the Earth, Sagume seemed be aware of her taking action during Legacy of Lunatic Kingdom events and calls her Lady Yagokoro (八意様,Yagokoro-sama).
Later, Sagume is seen speaking with Eirin in an article of Alternative Facts in Eastern Utopia by Aya, although the subject of the conversation is unknown.

When Reisen meets Sagume during Legacy of Lunatic Kingdom events, she recognizes her as one of the Goddesses and address her as proper. Sagume recognizes Reisen as "the rabbit that fell to Earth" from Eirin's place.

Even though she has a "defeated" sprite in the game's code, it is never used. ZUN made the image as part of his workflow, but didn't use it as the dialogue after battle is many times longer than the pre-battle dialogue, and didn't like Sagume being in a defeated state the whole time.[5]

Species: Lunarian
Ability: Capable of inverting a situation by speaking about it

A resident of the Moon.
She normally occupies a very important post amongst the Moon's people, and doesn't often show herself publicly.
She can tentatively be classified as a divine spirit, but her nature is neither that of a god, nor oni, nor departed soul.

She doesn't usually talk much, but this is a result of her ability.
When she speaks about any particular situation, (particularly to those who are thought to be involved,)
that situation will begin to proceed in its opposite way.
This power is similar to that of amanojaku, but she is a divine spirit ranked far above amanojaku.
Amanojaku only speak contrarily, but in her case, with her words the world acts contrarily.

Should she try to accomplish something, it will end in failure,
and if something bad is occurring, she has the ability to find a solution.
It's not as if the situation will always improve for her personally.
She's truly a divine spirit whose 'words can lead to disaster', as the saying goes.

To avoid the encroachment of impurity from Junko's attack, the sages of the Moon froze the Lunar Capital.
At the same time, they evacuated the People of the Moon into the Dream World.
The Capital within the Dream World was just like the ordinary Lunar Capital that its residents imagined.
The People of the Moon residing there never doubted that it was the real thing.

However, they certainly couldn't stay cooped up in the Dream World forever.
The longer a dream becomes, the more it can erode one's mind.

The "Lunar Capital Transfer Plan" was to purify Gensokyo and build a new capital there.
To 'purify' is to eliminate life and death.
That is to say, they were going to annihilate all the living things on its surface.
However, it wouldn't be easy. Their opponents were the youkai living in Gensokyo.

She thought that the spread of a particular urban legend in Gensokyo would make a good shortcut.
Using her power, she created a secret Power Stone.
That Power Stone had the power to change the world with people's words.
Just by being near it, rumors (ie. urban legends) that shouldn't exist would materialize.
A terrifying curio indeed.

When the urban legends began to materialize, she simply had to wait
for someone to spread one particularly famous urban legend. That was the plan.

That famous urban legend was the "Apollo Project Coverup Theory."
An unfounded rumor that "NASA is hiding the truth of what they saw on the Moon."
That is to say: if a rumor spread that NASA was hiding information about the lunar civilization they saw,
that very civilization, the Lunar Capital, would materialize in Gensokyo.

...however, this plan was no more than insurance.
She wasn't totally serious about it, and none of the Moon's people wanted
to move the capital to begin with. Returning to the Moon would be ideal.
All the same, though, as much as they needed to fight back against Junko,
they had no way of resisting her attack.

It was then that one of Gensokyo's humans arrived.
She never imagined that Doremy would send a human to the Lunar Capital,
but decided to test the human's power anyway. She found that they were strong indeed.

I'll place my bet on this human, she thought.If I speak the truth to them, the situation will reverse itself with them at the center.My Capital Migration Strategy will fail, but since Junko's attack will also fail, we'll break even.It doesn't matter what this human will do afterward, as long as the Lunar Capital is saved...

↑Strange Creators of Outer World: Legacy of Lunatic Kingdom interview: Interviewer: "Even when Sagume loses, her clothes don't get messed up."; ZUN: "That's right. I have a picture of her, but I didn't use it (laugh). I drew it as part of my workflow, but it was a waste."; Interviewer: "Because she's strong?"; ZUN: "The dialogue before the battle is short, and the dialogue after it is long, so I couldn't have her stay in the defeated pose the whole time. And it would be embarrassing if her clothes were messed up when she was only testing their powers (laugh)."